A Clan that dates
back to the Sons of Milesius. To be more precise, Heber, son of
Milesius. Heber had a son that ruled after him named Eoghan Taiglech
(Owen the Splendid) who in turn helped to give birth to Munster's
First King - Oilloill Olum - who died in 234 A.D. King Oilloill
Olum himself helped to give birth to...Cormac Cas, who is a direct
ancestor of all Hannons and ruled Munster until his death in 254 A.D.

Historical records also show that "Hannon" was
a sept of Siol Anmchadha in south-east Galway. By 1890, the surname
was principally found in Counties Sligo, Roscommon, Limerick, Cork and
Galway. Other spellings of the name are Hannan, Hanneen, Hannen, O'Hannon.

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